I just think it is your clutch fan actually turning on, its getting hoter now and they are starting to engage agian, Mine sounds like a UPS truck!!! Try to just remove it by takin off the four bolts connected to the water pump pully, pull the fan off bolt the four bolts back on so you pully doesn't fall off, and see if you still hear it.
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FRontline (marinating since 02)
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